body{
    margin: 0;
    padding: 0;
}
#page{
    border: 1px solid;
    width: 100%;
}
#page .header{
    border: 1px solid;
}
#page .body{
    border: 1px solid;
    overflow: hidden;
    margin-top: 15px;
}
#page .body > div{
    margin-top: 10px;
    margin-bottom: 10px;
}
#page .body .mainmenu{
    width: 25%;
}
#page .body .content{
    border: 1px solid;
    width: 73%;
    margin-left: 15px;
}


.left{float: left;}